预应力混凝土桥梁施工监控应力修正及应用分析

Stress Correction and Application Analysis of Pre-Stressed Concrete Bridge Construction Monitoring

准确修正主梁监测应力是预应力混凝土桥梁施工控制的重要问题。考虑悬臂施工时桥梁荷载逐步施加的特点,提出了一种大跨度预应力混凝土桥梁监测应力的修正方法。将该方法应用于某高铁大跨度连续梁主梁的关键截面实测应力计算,并将计算结果与传统修正方法、理论值对比分析。结果表明,修正的应力值与理论值吻合较好,误差显著减小,验证了该修正方法的可靠性与准确性。

It is an important problem for the construction control of pre-stressed concrete girder bridge to correct the monitoring stress of girder accurately.Considering the characteristics of the gradual application of the bridge load during the cantilever construction,a correction method for the monitoring stress of the long-span pre-stressed concrete bridge is proposed.The method is applied to the stress calculation of the key section of a high-speed railway long-span continuous beam,and the calculation results are compared with the traditional correction method and theoretical value.The results show that the modified stress value is in good agreement with the theoretical value,and the error is significantly reduced,which verifies the reliability and accuracy of the modified method.